This post contains spoilers for this week’s episode of Alien: Earth , “Emergence,” now streaming on Hulu .

The amount of time it takes a Xenomorph to gestate from face-hugger to chest-burster to full-sized monster has varied from film to film in the Alien series. In some movies, the chest-burster can take days to make its disgusting appearance; in others, it happens very quickly, as later directors assume the audience knows the whole life cycle and would like to get to the point already.

Though Noah Hawley is most reverent towards the first two films — particularly Alien , where it takes a while for Kane to die — he definitely falls in with the later movies on the timeline question. Arthur got attacked by a face-hugger at the end of last week’s episode. “Emergence” covers what s

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